The Spectrum Character of Strong Ground Motion's Signal Based on Complexity Method
Jiankang Li · Fuza xitong yu fuzaxing kexue · 2007
Some time it is not necessary to know all statistical information of the stochastic variable in studying of non-stationary acceleration time history,some representative information is simply to be known.Based on symbol group of Lempel-Ziv complexity,the symbol sequence and symbol group are been got from graining the random signal.The symbol space can be got by linearly plus all symbol groups.The sample data of random signal are been separated into n subsection,formation one n row data matrix.The singular value is been obtained by proceeding SVD of the coefficient matrix of the symbol space.The singular value is frequency;the stand and deviation of the row corresponding to the frequency in the data matrix is amplitude.A comparison of its results and that by FFT method shows that the proposed method is feasible.The data of non-stationary random signal can be analyzed at first hand,without to presume artificially.